Biodiversity Patterns in Flooded and Unflooded Forests
Summary
Flooded forests, such as seasonally inundated floodplain woodlands, and unflooded (terra firme) forests exemplify two complementary hydrological regimes that shape tropical biodiversity. In flooded forests, annual flood pulses deposit nutrient-rich sediments, fostering high primary productivity, dynamic successional mosaics and distinctive canopy structures. Species here exhibit specialised life-history traits—such as flood-tolerant seed banks, arboreal dispersal and periodic lateral movements—to cope with alternating aquatic and terrestrial phases. By contrast, terra firme forests occur on well-drained, nutrient-poor soils, supporting slower-growing tree assemblages, deeper litter layers and communities reliant on stable microhabitats. Although overall species richness may be comparable at landscape scale, community composition, functional diversity and trophic networks diverge markedly. Flooded forests serve as critical nurseries for fish, amphibians and waterbirds, while many terrestrial mammals and understory birds concentrate in unflooded areas. Seasonal connectivity between these forest types facilitates dispersal and resource tracking, reinforcing the importance of hydrological heterogeneity for metacommunity dynamics. Recognising these patterns is essential for carbon storage estimates, hydrological regulation and resilient conservation planning under climate change, as maintaining connectivity across hydrological gradients ensures the persistence of endemic and specialised taxa.
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Biodiversity Patterns in Flooded and Unflooded Forests publication trend
The graph below shows the total number of articles in biodiversity patterns in flooded and unflooded forests across all publications each year (not limited to Nature Index journals).
Technical terms
Terra firme: Non-inundated tropical forest on well-drained soils, characterised by stable substrate and relatively nutrient-poor conditions.
Várzea forest: Seasonally flooded Amazonian forest on white-water floodplains enriched by alluvial sediments.
Flood pulse: Periodic rise and fall of water levels that drives nutrient deposition and habitat transformation in inundated ecosystems.
References
- Spatial patterns of medium and large size mammal assemblages in várzea and terra firme forests, Central Amazonia, Brazil. PLOS ONE (2018).
- Seasonal dynamics of terrestrial vertebrate abundance between Amazonian flooded and unflooded forests. PeerJ (2018).
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